LOS ANGELES (Variety.com) - Julia Louis-Dreyfus, star of the legendary sitcom Seinfeld, announced via Twitter on Thursday that she had been diagnosed with breast cancer.

Louis-Dreyfus, who recently broke the record for the most Emmy wins in the same category, after snagging her sixth trophy for outstanding lead actress in a comedy series for her work on Veep, used her diagnosis as an opportunity to advocate for universal healthcare.

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She acknowledged that although she has "the most glorious group of supportive and caring family and friends, and fantastic insurance though [her] union," not every woman diagnosed with cancer would have access to those resources.

Hollywood was quick to react to the news, with most sending best wishes to Louis-Dreyfus and her family, and several supporting her use of her platform to advocate for healthcare reform.

Anna Kendrick wrote, "F--. F--. I don't think I realized how much I love this woman, who I don't know. Love her more for speaking up for others in this moment."

Kathy Griffin, who recently lost her sister Joyce to cancer, posted a lengthy thread commending Louis-Dreyfus for using her diagnosis to shine a light on universal healthcare, and addressing those responding negatively to Louis-Dreyfus' message.